| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform condensorless inverter control by making the capacity of a capacitor remarkably small even in case that thunder surge is superposed. <P>SOLUTION: A multiphase current supply circuit is equipped with a converter 2, an intervening circuit 3a, an inverter 4, a control circuit 6, and a lightning arrestor 7. A power system 1 is connected via the lightning arrestor 7 to the converter 2, and AC voltage V<SB>in</SB>is rectified. The intervening circuit 3a has a capacitor 31 and a bypass 33 connected in parallel with it. In the bypass 33, a diode D<SB>S</SB>, a resistor R<SB>S</SB>, and a capacitor C<SB>S</SB>are connected in series, and the direction of going from the anode to the cathode of the diode D<SB>S</SB>accords with the direction of going from the high-potential side to the low-potential side of a smoothing capacitor. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
